hair seal vs phocine

hair seal

noun
  • especially the true seals or earless seals of family Phocidae. 

  • Any of various seals which have coarse hair rather than fur 

phocine

noun
  • A member of the subfamily Phocinae, comprising the "true" or "earless" seals. 

adj
  • Pertaining to a seal (or similar pinnipeds); seallike. 

How often have the words hair seal and phocine occurred in a corpus of books? (source: Google Ngram Viewer )